Share

Corn yield declined as C:N increased

This figure illustrates how at our research station site the corn yield declined as the C:N of the cover crop increased. In this management year we let the cover crops before corn grow until the rye had headed out and the canola had flowered, both of which can increase the C:N of the cover crop and possibly lead to more immobilization. In subsequent years we have aimed to terminate our cover crops while cereal rye is still "in the boot" and canola has not had a chance to lignify as greatly, with the expectation that this will keep the C:N lower and tie up less nitrogen from the following corn cash crop.
Corn yield declined as C:N increased
Full-size image: 27 KB | View image View Download image Download